ContextualVersionConflict: (pbr 0.11.1 (/usr/local/lib/python2.7/dist-packages), Requirement.parse('pbr>=1.6'), set(['oslo.i18n', 'python-keystoneclient', 'oslo.utils', 'oslo.middleware', 'oslo.context', 'stevedore', 'oslo.log', 'keystone', 'oslo.serialization', 'keystonemiddleware', 'oslo.db', 'oslo.messaging', 'oslo.concurrency']))

[caowei]

sudo tail -f /var/log/apache2/keystone.log
    return loader.get_context(object_type, name, global_conf)
  File "/usr/local/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 620, in get_context
    object_type, name=name)
  File "/usr/local/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 640, in find_egg_entry_point
    pkg_resources.require(self.spec)
  File "/usr/local/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 943, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/local/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 834, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
ContextualVersionConflict: (pbr 0.11.1 (/usr/local/lib/python2.7/dist-packages), Requirement.parse('pbr>=1.6'), set(['oslo.i18n', 'python-keystoneclient', 'oslo.utils', 'oslo.middleware', 'oslo.context', 'stevedore', 'oslo.log', 'keystone', 'oslo.serialization', 'keystonemiddleware', 'oslo.db', 'oslo.messaging', 'oslo.concurrency']))